Journal
CARBON
Volume 122, Issue -, Pages 237-246Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2017.06.046
Keywords
Fuel cells; NS-3DrGO catalysts; Oxygen reduction reaction; Durability
Funding
- National Science Foundation of China [51572114, 51672112]
- Key University Science Research Project of Jiangsu Province [16KJB430009]
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Developing earth-abundant materials to replace platinum (Pt)/Pt-based materials is an inevitable tendency for the progress of fuel cells due to the practical application limits. Recently, heteroatoms doped (N, S et al.) carbon materials, such as carbon nanotubes and graphene, have attracted great interests because of their amazing electrochemical activity towards oxygen reduction reaction (ORR). Herein, nitrogen and sulfur dual-doped three-dimensional reduced graphene oxide (NS-3DrGO) catalysts have been synthesized by a soft template-assisted approach followed by heat-pyrolysis treatment. Results indicate that with high specific surface area, sufficient porous structures, as well as the well-dispersed and doped atoms of N and S, the NS-3DrGO catalysts possess high onset/half-wave potentials together with large diffusing-limiting current density and present a four-electron transfer process in alkaline media. Specifically, at a relatively higher annealing temperature of 950 degrees C, the NS-3DrGO catalyst presents the optimal ORR activity compared with the others, which may be due to its highest amount (74.8 at. %) of the two active nitrogen species (pyridinic N and graphitic N) and the highest amount (79.8 at. %) of active thiophene-S together with the desirable specific surface (391.9 m(2) g(-1)) area and multi-porous structure. Furthermore, the NS-3DrGO catalysts also exhibit superior methanol tolerance and favorable durability. (C) 2017 Elsevier Ltd. All rights reserved.
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